7951255813 has 4 divisors (see below), whose sum is σ = 8207747968. Its totient is φ = 7694763660.

The previous prime is 7951255799. The next prime is 7951255841. The reversal of 7951255813 is 3185521597.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3185521597 = 23 ⋅138500939.

It is a cyclic number.

It is not a de Polignac number, because 7951255813 - 2¹³ = 7951247621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7951255853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128246031 + ... + 128246092.

It is an arithmetic number, because the mean of its divisors is an integer number (2051936992).

Almost surely, 2^7951255813 is an apocalyptic number.

It is an amenable number.

7951255813 is a deficient number, since it is larger than the sum of its proper divisors (256492155).

7951255813 is a wasteful number, since it uses less digits than its factorization.

7951255813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256492154.

The product of its digits is 378000, while the sum is 46.

The square root of 7951255813 is about 89169.8144721632. The cubic root of 7951255813 is about 1995.9297063911.

The spelling of 7951255813 in words is "seven billion, nine hundred fifty-one million, two hundred fifty-five thousand, eight hundred thirteen".